* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-dark: #1a1a2e;
  --bg-darker: #0f0f1e;
  --accent-gold: #d4af37;
  --accent-warm: #e8b76b;
  --text-light: #f0f0f0;
  --text-muted: #b0b0b0;
  --card-bg: #2a2a3e;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-dark: #faf8f3;
    --bg-darker: #ede8e0;
    --accent-gold: #d4af37;
    --accent-warm: #e8b76b;
    --text-light: #2a2a2a;
    --text-muted: #666;
    --card-bg: #fff5eb;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  }
}

body {
  background: var(--bg-dark);
  color: var(--text-light);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow-x: hidden;
}

/* Stars background */
.stars-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-image:
    radial-gradient(2px 2px at 20% 30%, white, rgba(255, 255, 255, 0.2)),
    radial-gradient(2px 2px at 60% 70%, white, rgba(255, 255, 255, 0.2)),
    radial-gradient(1px 1px at 50% 50%, white, rgba(255, 255, 255, 0.1)),
    radial-gradient(1px 1px at 80% 20%, white, rgba(255, 255, 255, 0.1)),
    radial-gradient(2px 2px at 90% 10%, white, rgba(255, 255, 255, 0.2)),
    radial-gradient(1px 1px at 30% 80%, white, rgba(255, 255, 255, 0.1));
  background-repeat: repeat;
  background-size: 200% 200%;
  opacity: 0.5;
}

@media (prefers-color-scheme: light) {
  .stars-bg {
    opacity: 0.1;
  }
}

header.hero {
  position: relative;
  text-align: center;
  padding: 4rem 2rem 3rem;
  z-index: 10;
}

#site-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--accent-warm) 0%, var(--accent-gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.05em;
}

#tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 300;
}

main.shelf {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  z-index: 5;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 2.5rem;
  animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Book card */
.book-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  outline: none;
}

.book-card:hover,
.book-card:focus-visible {
  transform: translateY(-8px);
}

.card-cover {
  width: 100%;
  aspect-ratio: 3/4;
  background-size: cover;
  background-position: center;
  border-radius: 12px;
  box-shadow: var(--shadow);
  position: relative;
  transition: all 0.3s ease-out;
  overflow: hidden;
}

.book-card:hover .card-cover {
  box-shadow: 0 12px 48px rgba(212, 175, 55, 0.3),
              0 8px 32px rgba(0, 0, 0, 0.4);
  filter: brightness(1.05);
}

.card-cover::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.3) 100%);
  opacity: 0;
  transition: opacity 0.3s ease-out;
}

.book-card:hover .card-cover::after {
  opacity: 1;
}

.card-info {
  padding: 1.2rem 0;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-info h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex-grow: 1;
}

.card-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  background: var(--card-bg);
  border: 1px solid var(--accent-gold);
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--accent-warm);
  font-weight: 500;
}

@media (prefers-color-scheme: light) {
  .badge {
    background: rgba(212, 175, 55, 0.1);
    color: #8b6f47;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
  }

  #site-title {
    font-size: 2rem;
  }

  main.shelf {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .book-grid {
    grid-template-columns: 1fr;
  }

  #site-title {
    font-size: 1.5rem;
  }

  header.hero {
    padding: 2rem 1rem 1.5rem;
  }
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-light);
}

footer.footer {
  position: relative;
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  z-index: 10;
  border-top: 1px solid rgba(212, 175, 55, 0.1);
}

footer.footer a {
  color: var(--accent-warm);
  text-decoration: none;
  transition: color 0.3s ease;
}

footer.footer a:hover {
  color: var(--accent-gold);
}

/* Focus visible for accessibility */
.book-card:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 4px;
  border-radius: 12px;
}